
三年级科学-滑轮
Authored by YEO Moe
Science
3rd Grade
20 Questions
Used 471+ times

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1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
图中是什么简单机械?
轮轴
齿轮
轮子
滑轮
2.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪项是图中简单机械的用处?
提起重物
切开物体
推动重物
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
图中是哪一类滑轮?
动滑轮
定滑轮
滑轮组
4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪一个是动滑轮?
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
利用上图简单机械提升重物时, 需要向什么方向用力?
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪一种机械种类能帮助我们省力?
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
下面哪项有关图中机械的说明是正确的?
滑轮组不能省力
滑轮组能改变力的方向,但不能省力
滑轮组能改变力的方向,也能省力。
滑轮组不能改变力的方向,但能省力
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